/*
* STK1160 driver
*
* Copyright (C) 2012 Ezequiel Garcia
* <elezegarcia--a.t--gmail.com>
*
* Based on Easycap driver by R.M. Thomas
* Copyright (C) 2010 R.M. Thomas
* <rmthomas--a.t--sciolus.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* TODO:
*
* 1. (Try to) detect if we must register ac97 mixer
* 2. Support stream at lower speed: lower frame rate or lower frame size.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <media/saa7115.h>
#include "stk1160.h"
#include "stk1160-reg.h"
static unsigned int input;
module_param(input, int, 0644);
MODULE_PARM_DESC(input, "Set default input");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ezequiel Garcia");
MODULE_DESCRIPTION("STK1160 driver");
/* Devices supported by this driver */
static struct usb_device_id stk1160_id_table[] = {
{ USB_DEVICE(0x05e1, 0x0408) },
{ }
};
MODULE_DEVICE_TABLE(usb, stk1160_id_table);
/* saa7113 I2C address */
static unsigned short saa7113_addrs[] = {
0x4a >> 1,
I2C_CLIENT_END
};
/*
* Read/Write stk registers
*/
int stk1160_read_reg(struct stk1160 *dev, u16 reg, u8 *value)
{
int ret;
int pipe = usb_rcvctrlpipe(dev->udev, 0);
*value = 0;
ret = usb_control_msg(dev->udev, pipe, 0x00,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0x00, reg, value, sizeof(u8), HZ);
if (ret < 0) {
stk1160_err("read failed on reg 0x%x (%d)\n",
reg, ret);
return ret;
}
return 0;
}
int stk1160_write_reg(struct stk1160 *dev, u16 reg, u16 value)
{
int ret;
int pipe = usb_sndctrlpipe(dev->udev, 0);
ret = usb_control_msg(dev->udev, pipe, 0x01,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
value, reg, NULL, 0, HZ);
if (ret < 0) {
stk1160_err("write failed on reg 0x%x (%d)\n",
reg, ret);
return ret;
}
return 0;
}
void stk1160_select_input(struct stk1160 *dev)
{
int route;
static const u8 gctrl[] = {
0x98, 0x90, 0x88, 0x80, 0x98
};
if (dev->ctl_input == STK1160_SVIDEO_INPUT)
route = SAA7115_SVIDEO3;
else
route = SAA7115_COMPOSITE0;
if (dev->ctl_input < ARRAY_SIZE(gctrl)) {
v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_routing,
route, 0, 0);
stk1160_write_reg(dev, STK1160_GCTRL, gctrl[dev->ctl_input]);
}
}
/* TODO: We should break this into pieces */
static void stk1160_reg_reset(struct stk1160 *dev)
{
int i;
static const struct regval ctl[] = {
{STK1160_GCTRL+2, 0x0078},
{STK1160_RMCTL+1, 0x0000},
{STK1160_RMCTL+3, 0x0002},
{STK1160_PLLSO, 0x0010},
{STK1160_PLLSO+1, 0x0000},
{STK1160_PLLSO+2, 0x0014},
{STK1160_PLLSO+3, 0x000E},
{STK1160_PLLFD, 0x0046},
/* Timing generator setup */
{STK1160_TIGEN, 0x0012},
{STK1160_TICTL, 0x002D},
{STK1160_TICTL+1, 0x0001},
{STK1160_TICTL+2, 0x0000},
{STK1160_TICTL+3, 0x0000},
{STK1160_TIGEN, 0x0080},
{0xffff, 0xffff}
};
for (i = 0; ctl[i].reg != 0xffff; i++)
stk1160_write_reg(dev, ctl[i].reg, ctl[i].val);
}
static void stk1160_release(struct v4l2_device *v4l2_dev)
{
struct stk1160 *dev = container_of(v4l2_dev, struct stk1160, v4l2_dev);
stk1160_info("releasing all resources\n");
stk1160_i2c_unregister(dev);
v4l2_ctrl_handler_free(&dev->ctrl_handler);
v4l2_device_unregister(&dev->v4l2_dev);
kfree(dev->alt_max_pkt_size);
kfree(dev);
}
/* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
/*
* Scan usb interface and populate max_pkt_size array
* with information on each alternate setting.
* The array should be allocated by the caller.
*/
static int stk1160_scan_usb(struct usb_interface *intf, struct usb_device *udev,
unsigned int *max_pkt_size)
{
int i, e, sizedescr, size, ifnum;
const struct usb_endpoint_descriptor *desc;
bool has_video = false, has_audio = false;
const char *speed;
ifnum = intf->altsetting[0].desc.bInterfaceNumber;
/* Get endpoints */
for (i = 0; i < intf->num_altsetting; i++) {
for (e = 0; e < intf->altsetting[i].desc.bNumEndpoints; e++) {
/* This isn't clear enough, at least to me */
desc = &intf->altsetting[i].endpoint[e].desc;
sizedescr = le16_to_cpu(desc->wMaxPacketSize);
size = sizedescr & 0x7ff;
if (udev->speed == USB_SPEED_HIGH)
size = size * hb_mult(sizedescr);
if (usb_endpoint_xfer_isoc(desc) &&
usb_endpoint_dir_in(desc)) {
switch (desc->bEndpointAddress) {
case STK1160_EP_AUDIO:
has_audio = true;
break;
case STK1160_EP_VIDEO:
has_video = true;
max_pkt_size[i] = size;
break;
}
}
}
}
/* Is this even possible? */
if (!(has_audio || has_video)) {
dev_err(&udev->dev, "no audio or video endpoints found\n");
return -ENODEV;
}
switch (udev->speed) {
case USB_SPEED_LOW:
speed = "1.5";
break;
case USB_SPEED_FULL:
speed = "12";
break;
case USB_SPEED_HIGH:
speed = "480";
break;
default:
speed = "unknown";
}
dev_info(&udev->dev, "New device %s %s @ %s Mbps (%04x:%04x, interface %d, class %d)\n",
udev->manufacturer ? udev->manufacturer : "",
udev->product ? udev->product : "",
speed,
le16_to_cpu(udev->descriptor.idVendor),
le16_to_cpu(udev->descriptor.idProduct),
ifnum,
intf->altsetting->desc.bInterfaceNumber);
/* This should never happen, since we rejected audio interfaces */
if (has_audio)
dev_warn(&udev->dev, "audio interface %d found.\n\
This is not implemented by this driver,\
you should use snd-usb-audio instead\n", ifnum);
if (has_video)
dev_info(&udev->dev, "video interface %d found\n",
ifnum);
/*
* Make sure we have 480 Mbps of bandwidth, otherwise things like
* video stream wouldn't likely work, since 12 Mbps is generally
* not enough even for most streams.
*/
if (udev->speed != USB_SPEED_HIGH)
dev_warn(&udev->dev, "must be connected to a high-speed USB 2.0 port\n\
You may not be able to stream video smoothly\n");
return 0;
}
static int stk1160_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
int rc = 0;
unsigned int *alt_max_pkt_size; /* array of wMaxPacketSize */
struct usb_device *udev;
struct stk1160 *dev;
udev = interface_to_usbdev(interface);
/*
* Since usb audio class is supported by snd-usb-audio,
* we reject audio interface.
*/
if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO)
return -ENODEV;
/* Alloc an array for all possible max_pkt_size */
alt_max_pkt_size = kmalloc(sizeof(alt_max_pkt_size[0]) *
interface->num_altsetting, GFP_KERNEL);
if (alt_max_pkt_size == NULL)
return -ENOMEM;
/*
* Scan usb posibilities and populate alt_max_pkt_size array.
* Also, check if device speed is fast enough.
*/
rc = stk1160_scan_usb(interface, udev, alt_max_pkt_size);
if (rc < 0) {
kfree(alt_max_pkt_size);
return rc;
}
dev = kzalloc(sizeof(struct stk1160), GFP_KERNEL);
if (dev == NULL) {
kfree(alt_max_pkt_size);
return -ENOMEM;
}
dev->alt_max_pkt_size = alt_max_pkt_size;
dev->udev = udev;
dev->num_alt = interface->num_altsetting;
dev->ctl_input = input;
/* We save struct device for debug purposes only */
dev->dev = &interface->dev;
usb_set_intfdata(interface, dev);
/* initialize videobuf2 stuff */
rc = stk1160_vb2_setup(dev);
if (rc < 0)
goto free_err;
/*
* There is no need to take any locks here in probe
* because we register the device node as the *last* thing.
*/
spin_lock_init(&dev->buf_lock);
mutex_init(&dev->v4l_lock);
mutex_init(&dev->vb_queue_lock);
rc = v4l2_ctrl_handler_init(&dev->ctrl_handler, 0);
if (rc) {
stk1160_err("v4l2_ctrl_handler_init failed (%d)\n", rc);
goto free_err;
}
/*
* We obtain a v4l2_dev but defer
* registration of video device node as the last thing.
* There is no need to set the name if we give a device struct
*/
dev->v4l2_dev.release = stk1160_release;
dev->v4l2_dev.ctrl_handler = &dev->ctrl_handler;
rc = v4l2_device_register(dev->dev, &dev->v4l2_dev);
if (rc) {
stk1160_err("v4l2_device_register failed (%d)\n", rc);
goto free_ctrl;
}
rc = stk1160_i2c_register(dev);
if (rc < 0)
goto unreg_v4l2;
/*
* To the best of my knowledge stk1160 boards only have
* saa7113, but it doesn't hurt to support them all.
*/
dev->sd_saa7115 = v4l2_i2c_new_subdev(&dev->v4l2_dev, &dev->i2c_adap,
"saa7115_auto", 0, saa7113_addrs);
stk1160_info("driver ver %s successfully loaded\n",
STK1160_VERSION);
/* i2c reset saa711x */
v4l2_device_call_all(&dev->v4l2_dev, 0, core, reset, 0);
v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
/* reset stk1160 to default values */
stk1160_reg_reset(dev);
/* select default input */
stk1160_select_input(dev);
stk1160_ac97_register(dev);
rc = stk1160_video_register(dev);
if (rc < 0)
goto unreg_i2c;
return 0;
unreg_i2c:
stk1160_i2c_unregister(dev);
unreg_v4l2:
v4l2_device_unregister(&dev->v4l2_dev);
free_ctrl:
v4l2_ctrl_handler_free(&dev->ctrl_handler);
free_err:
kfree(alt_max_pkt_size);
kfree(dev);
return rc;
}
static void stk1160_disconnect(struct usb_interface *interface)
{
struct stk1160 *dev;
dev = usb_get_intfdata(interface);
usb_set_intfdata(interface, NULL);
/*
* Wait until all current v4l2 operation are finished
* then deallocate resources
*/
mutex_lock(&dev->vb_queue_lock);
mutex_lock(&dev->v4l_lock);
/* Here is the only place where isoc get released */
stk1160_uninit_isoc(dev);
/* ac97 unregister needs to be done before usb_device is cleared */
stk1160_ac97_unregister(dev);
stk1160_clear_queue(dev);
video_unregister_device(&dev->vdev);
v4l2_device_disconnect(&dev->v4l2_dev);
/* This way current users can detect device is gone */
dev->udev = NULL;
mutex_unlock(&dev->v4l_lock);
mutex_unlock(&dev->vb_queue_lock);
/*
* This calls stk1160_release if it's the last reference.
* therwise, release is posponed until there are no users left.
*/
v4l2_device_put(&dev->v4l2_dev);
}
static struct usb_driver stk1160_usb_driver = {
.name = "stk1160",
.id_table = stk1160_id_table,
.probe = stk1160_probe,
.disconnect = stk1160_disconnect,
};
module_usb_driver(stk1160_usb_driver);